Just tried to find a torque spec in my Service manual and nothing found in there. The owners manual refers to the Det sensor but no torque spec. Cylinder head torque spec is 18-22 ft-lbs in the service manual. I would think that should do.
Thanks for the info. Before I saw this I torqued it to same spec as Audi knock sensors which is 20NM or 14.7 ft/lbs. Sounds like I wasn't too far off from the 08 spec...